11521663535 has 4 divisors (see below), whose sum is σ = 13825996248. Its totient is φ = 9217330824.

The previous prime is 11521663513. The next prime is 11521663537. The reversal of 11521663535 is 53536612511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11521663535 - 2⁶ = 11521663471 is a prime.

It is a super-2 number, since 2×11521663535² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521663537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1152166349 + ... + 1152166358.

It is an arithmetic number, because the mean of its divisors is an integer number (3456499062).

Almost surely, 2^11521663535 is an apocalyptic number.

11521663535 is a deficient number, since it is larger than the sum of its proper divisors (2304332713).

11521663535 is an equidigital number, since it uses as much as digits as its factorization.

11521663535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304332712.

The product of its digits is 81000, while the sum is 38.

The spelling of 11521663535 in words is "eleven billion, five hundred twenty-one million, six hundred sixty-three thousand, five hundred thirty-five".